I wasn't fat because I lacked willpower - it's not that simple
Willpower is a strange and complicated concept – especially when it comes to losing weight. Those who don’t lose weight are judged not to have it – and judged constantly.
It is rarely a trait that people fully understand themselves, yet it is an attribute that is conferred on them. I have lost weight, therefore I have willpower. I am, it is concluded, morally superior to those who have not; I have some quality they don’t.